This almost comes across as a paradox. If she just washed it, how come is smells like food? I believe the author used this to emphasize how hard working she is and that she works constantly.

I wasn't able to highlight the "fits like a lover," but I feel that the author used this simile to emphasize that the sweater fits well and smothers him like a lover would.

Why did the author use blue? Is this implying that the morning was sad? Or was the sky literally blue?

Does this mean the burden? Whatever the word means, it is being used to describe the refried beans.